Tiny Doctors lyrics

I'm never sad anymore since the day
I found out something about myself
Now I know that I have a thing in me
I can say I'm in the clear

Tiny, tiny doctors, doctors
Swimming in my veins
Taing care of business inside me
Clearing up the illness and pain
Helpful, very concerned
Putting all their medical experience to work

Submitted by Guest

What do you think is the meaning of Tiny Doctors by They Might Be Giants?